They are, I think, the rear door bump stops.
The Formation sign is the same throughout the Div. I'm away at the moment, and have only limited ref with me, so cannot look into the knight symbol till I get home early Feb. But the ref I have with me on the formation sign are as stated earlier.
Incidentally, in August 1943, 21 Field Regt was amalgamated with 22 Fd Regt and the combined regt elected to join the AIF to become 21/22 Field Regt (AIF). The Unit sign red over blue with 76 remained the same for the combined unit. So my earlier comment that the unit sign after Aug 1944 would be 21 over 74 was incorrect: it would have been 21-22 over 74.
What data do you have on the gun? Barrel make and mark and serial, breech block make and mark, saddle make and number, welded or riveted trail, etc: be interested to know some details, please.
Regards
Mike
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